kempy Posted July 5, 2015 Posted July 5, 2015 If you're going to use that chassis and transformers you'll need to consider what the original output tube was to match the OPT. Also you'll need a fairly grunty power transformer to run a pair of KT88's in stereo. kind of looks like it was a 6L6 or EL34 chassis. That's a very nice surround replacement! 1 Quote
TheAudioDude Posted July 5, 2015 Author Posted July 5, 2015 Thanks JVC's I find are one of the easier ones to fix and are surprisingly good sounding but I'm probably going to run them as rears with my SK-1000s or SK-600s The plan so far is to run the kt-88s in push pull like the original El37s were except it'll be using the center tap of the output transformer to feedback for a form ultalinear like some Leak and quad amps used. Yes it seems a waste of good tubes but because they are being run so quietly they'll last a long time Quote
TheAudioDude Posted July 5, 2015 Author Posted July 5, 2015 I was hoping for 20 or 25 watts from each mono block which is easily half of what you can get out of a pair. Something sort of like the Leak TL-50 Quote
kempy Posted July 5, 2015 Posted July 5, 2015 El37's are a really nice tube, I think they sound nicer than el34 or KT88 in a lot of applications. Why not stick to them? Also I can hook you up with HV caps nice and cheap if you need. 1 Quote
TheAudioDude Posted July 5, 2015 Author Posted July 5, 2015 One had EL37s written on it the other had KT-63s or 66s in it. I thought EL37s were quite hard to get these days? Quote
TheAudioDude Posted July 5, 2015 Author Posted July 5, 2015 I can hook you up with HV caps nice and cheap if you need. What kind? I've heard of people using several 600v 2200mf photo flash caps with good results? Quote
kempy Posted July 5, 2015 Posted July 5, 2015 Just general 450v electrolytic's and 630v foil caps for coupling/bypass. 2200uf is a Huge psu reservoir cap if you use a valve rectifier you'll fry it. most amp's are using 20-100uf caps with chokes or resistors in between. KT88's are even harder to get originals unless you go for new issue ones. Do you still have the original output tubes still and know what condition they're in? I have an AVO valve tester here you can test them on if you do. Quote
TheAudioDude Posted July 5, 2015 Author Posted July 5, 2015 yea just wondered about the photo caps, thought that wasn't right only have two KTs from one of them. First thing I need to do is strip, fill, primer, paint and polish them Quote
kempy Posted July 5, 2015 Posted July 5, 2015 Might be easier to get some reissue KT66's as typically they're designed around a 6K6 OPT, KT88's around a 2K5 OPT. Quote
TheAudioDude Posted July 6, 2015 Author Posted July 6, 2015 Might be easier to get some reissue KT66's as typically they're designed around a 6K6 OPT, KT88's around a 2K5 OPT. What reissue KT66's have you tried? Tung Sol any good? I should give up this Valve stuff and stick to vinyl, tapes, speakers and transistor amps. Quote
kempy Posted July 6, 2015 Posted July 6, 2015 I haven't really pursued them because I have original Osram and GEC ones. I have a couple of Chinese ones here just for the purpose of bench testing. Quote
TheAudioDude Posted July 6, 2015 Author Posted July 6, 2015 That's OK I'll see what I can get a set for. Quote
TheAudioDude Posted June 22, 2017 Author Posted June 22, 2017 Too Busy to do audio because of telstars..... 1 Quote
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